Annual report pursuant to Section 13 and 15(d)

Statements of Redeemable Convertible Preferred Stock and Stockholders' (Deficit) Equity

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Statements of Redeemable Convertible Preferred Stock and Stockholders' (Deficit) Equity - USD ($)
$ in Thousands
Total
Redeemable Convertible Preferred Stock
Common Stock
Note Receivable from Stockholder
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Balance at Dec. 31, 2015 $ (93,898)     $ (200) $ 3,378 $ (51) $ (97,025)
Temporary Equity Balance, Shares at Dec. 31, 2015   173,750,421          
Temporary Equity Balance at Dec. 31, 2015   $ 102,505          
Common Stock Balance, Shares at Dec. 31, 2015     416,279        
Exercise of common stock options for cash 184       184    
Exercise of common stock options for cash, Shares     35,552        
Stock-based compensation expense 968       968    
Vesting of early exercised shares 116       116    
Interest on note receivable from stockholder (7)     (7)      
Net unrealized gain (loss) on available-for-sale securities 34         34  
Net (loss) income 1,702           1,702
Balance at Dec. 31, 2016 (90,901)     (207) 4,646 (17) (95,323)
Temporary Equity Balance, Shares at Dec. 31, 2016   173,750,421          
Temporary Equity Balance at Dec. 31, 2016   $ 102,505          
Common Stock Balance, Shares at Dec. 31, 2016     451,831        
Exercise of common stock options for cash 95       95    
Exercise of common stock options for cash, Shares     13,499        
Stock-based compensation expense 1,391       1,391    
Vesting of early exercised shares 86       86    
Interest on note receivable from stockholder (1)     (1)      
Net unrealized gain (loss) on available-for-sale securities 17         17  
Net (loss) income (19,688)           (19,688)
Balance at Dec. 31, 2017 (109,001)     (208) 6,218   (115,011)
Temporary Equity Balance, Shares at Dec. 31, 2017   173,750,421          
Temporary Equity Balance at Dec. 31, 2017 102,505 $ 102,505          
Common Stock Balance, Shares at Dec. 31, 2017     465,330        
Issuance of Series C and E redeemable convertible preferred stock, net of issuance costs   $ 84,739          
Issuance of Series C and E redeemable convertible preferred stock, net of issuance costs, Shares   319,865,282          
Conversion of redeemable convertible preferred stock warrants to common stock warrants in connection with initial public offering 734       734    
Conversion of redeemable convertible preferred stock warrants to common stock warrants in connection with initial public offering 187,244   $ 16   187,228    
Conversion of redeemable convertible preferred stock and warrant to common stock in connection with initial public offering, Share   (493,615,703)          
Conversion of redeemable convertible preferred stock and warrant to common stock in connection with initial public offering   $ (187,244)          
Conversion of redeemable convertible preferred stock and warrant to common stock in connection with initial public offering, shares     16,007,762        
Exercise of preferred stock warrants for cash 268       268    
Exercise of preferred stock warrants for cash, Shares     20,700        
Exercise of common stock options and common stock warrants for cash 134       134    
Exercise of common stock options and common stock warrants for cash, Shares     20,726        
Issuance of common stock in connection with initial public offering, net of underwriting discount and offering costs 74,436   $ 6   74,430    
Issuance of common stock in connection with initial public offering, net of underwriting discount and offering costs, Shares     5,667,000        
Issuance of common stock in connection with private placement 10,000   $ 1   9,999    
Issuance of common stock in connection with private placement, Shares     666,666        
Stock-based compensation expense 2,872       2,872    
Vesting of early exercised shares 8       8    
Payment of note receivable by stockholder 208     $ 208      
Net unrealized gain (loss) on available-for-sale securities (47)         (47)  
Net (loss) income (35,317)           (35,317)
Balance at Dec. 31, 2018 131,539   $ 23   281,891 (47) (150,328)
Temporary Equity Balance, Shares at Dec. 31, 2018   0          
Common Stock Balance, Shares at Dec. 31, 2018     22,848,184        
Net (loss) income (1,493)            
Balance at Dec. 31, 2018 $ 131,539   $ 23   $ 281,891 $ (47) $ (150,328)
Temporary Equity Balance, Shares at Dec. 31, 2018   0          
Common Stock Balance, Shares at Dec. 31, 2018     22,848,184